Bag making machine



- GQA. HAUGH BAG MAKING MACHINE July 1, 1947.

Filed Jan. 11, 1943 2 Sheets-Sheet 1 Afforney July 1, 1947. G.- .'HA UGH BAG MAKING MACHINE Fild Jan. 11, 1943 2 Sheets-Sheet 2 Gordon A. i/zz Ugh Patented July 1, 1947 BAG MAKING MACHINE Gordon Alexander Haugh, Toronto, Ontario, Canada, assignor to Haughs Products Limited, Toronto, Ontario, Canada, a company of the Dominion of Canada App January 11 19a, Samm- 471 9 4 Claims. 1

This invention relates to a bag making ma chine andis particularly directed to providing improvements in such machines whereby the volume of production therefrom is greatly increased.

Various types of machines for the manufacture of bags are well known in the art. Such machines comprise, i general, a plurality of power driven rolls for advancing a strip of material through the machine. During its progress through the machine, the strip of material is folded and the edges joined to form bags of predetermined sizes. With the development of heat sealable material, the joined together edges oi the bags may be sealed. together by the application of heat and pressure.

Improvements have been made in bag making machines to adapt them for the manufacture of bags from heat scalable material. For example, Patent No. 2,261,591'discloses a bag making machine in which a strip of heat scalable material of indefinite length is advanced through the machine. During its advancement, the longitudinal edges of the strip are folded inwardly to overlap along the longitudinal axis and form a continu ous tube-like strip, The overlapped edges aljethen sealed, by the application of heat and pressure, after which the strip is sealed and cut transversely at predetermined intervals.

The present invention is particularly directed to providing improvements in bag makingmachines of the type wherein a strip of heat sealable material of indefinite length is formed into a tube-like strip and cut-into bags of predetermined size whereby the volume of prod-uction is doubled by a, relatively simplearrangement of parts and including an inexpensive cutting l or severing element which s easily mounted ,on the machine.

T e m thod of mak n as Q t e t nent en includ s the st s of foldi t n tudinaledges or a strip ofheat scalable material of ind finite length inwardly towards the longitucl n ax s ther o opp ed e be s cientlys ecl apart t r a i of d ma ation therebetween, cutting the strip longitudinally a ne th l ne at dem t o a sealing the fielded st p t n ly tn s e e mine int a e an pu t n e folded ri tran v rsely 1. 1 pr d t rmi d ngth The invention also contemplates improvements n has m king mac i es o ma n bas o a continuous strip of heat sealable'material of indefinite length and comprises, in general, means fe ad a ng the. rip of ma al hrq eh, the

bag of the end opening type;

:2 machine, means for folding'the edges ofthe strip inwardly towards the longitudinal axis thereof, the opposing edges being sufficiently spaced apart to leave a line of demarcation therebetween, means for continuously cutting the folded strip longitudinally along the line of demarcation, and means for heat sealing the Strips transversely "at predetermined intervals. l

An understanding of the invention and the objects and advantagesther'eof may be had from the following description and accompanying drawings, in which:

Figure 1 is a diagrammatic view in plan of a bag making machine embodying the present invention;

Figure 2 is a side elevation illustrating a preferred form of cutting arrangement; t

'Figure 3'-i1lustrates a detail of a portion of the strip of material inWhich is formed a pairof pouch-type bags;

Figure 4 is a view taken alongt-he linedl,

Figure 3; l

Figurefi is a diagrammatic view inplan ofa bag maki g machine embodying amodification ofthe invention;

Figure 6 is a side elevation of shown in Figure '5; a a

Figure 7 is a detail of the strip of material in which is formed a pairof end openingbags;

Figure 8 is an end elevation of the bag" strip shown in Figure 5; r l

Figure 9 is a perspective view of the arrangement a completed Figure 10 illustrates a modification of theinvention wherein a winding-roll issubstituted for the transverse cutting arrangement; and

Figure 11 is a perspective view of a further 'designof abagior-med on the machine.

Like reference characters refer to like parts throughout the specification and drawings.

The present --i;mpr-oyements in bag making machines arc described-in detail as applied to the bag making machine described andillustrated in Patent No. 2,261,591. It willbe understood, however, that the improvements are equally applicable to other bag making machines wherein a sheet of material is folded into the form .of a tube-like strip from which the bags are subsequently formed.

The bag making machine illustrated in Figure 1 comprises, in general, a roller (not shown) on which is nounted a roll of material suitable for forming into bags; feed rollers for advancin the material through the machine; tension r'ollers for maintaining the strip ofmaterial taut during its advancement through the machine; a former over which the longitudinal edges of the strip are folded inwardly towards the longitudinal axis of the strip; a cutting element for cutting the folded strip longitudinally during its advancement through the machine; an arrangement for heat sealing the strip; and a device for cutting the strips transversely at predetermined intervals; and an arrangement for dividing the flow of the severed pairs of bags; or, alternative to the transverse cutting arrangement, a roller on which the folded and heat sealed strips are wound.

Referring to the drawings, the numeral ID indicates a sheet of heat scalable material, such as that known under the trade name Pliofilm, of indefinite length in the process of being advanced through the bag making machine. The sheet of material is advanced, in the direction indicated by the arrow, from a feed roll (not shown) over a triangular or V-shaped table 9 to a former 911, over the surface of which the longitudinal edges H of the sheet are folded inwardly towards the longitudinal axis thereof to form a tube-like strip. In the preferred embodiment of the invention illustrated herein, the opposing edges of the strip are spaced slightly apart to leave between them a line of demarcation along the longitudinal axis of the strip, as indicated by the numeral l2. The former 9a can be designed, if desired, to fold the edges inwardly in overlapping relation.

The folded strip of material, after being formed in the manner indicated, is advanced through the vertical rollers l3, between the horizontal rollers, and over the horizontal roller l5. A cutting element l1, such as a knife edge as illustrated in Figure 2, or other suitable cutting arrangement. is mounted on the machine, pref-- erably immediately in front of the tension roll l5, in alignment with the longitudinally extending line of demarcation l2 in the strip of material. The cutting element is preferably mounted as to be adjustable in both the horizontal and vertical planes to sever the strip in contact therewith. The cutting element may be in the form.

of a sharp edge, such as a razor blade, or in any other form by means of which the strip can be severed continuously in a clean cutting action along the predetermined line of demarcation.

The material advancing from the cutting element is in the form of two longitudinally folded strips, severed along the line indicated by the numeral [6. The strips are passed between the rolls l1, thence downwardly to the heat sealing device, the strips being maintained taut by the tension roller 2|. The heat sealing arrangement comprises a roller 22 and a roller l9, between which rollers the severed strips of material are passed. Two spaced apart electrically heated elements are mounted on the roller 19, preferably rojecting slightly outwardly from the opposite faces thereof as indicated by the numeral 20. In the rotation. of roller [9. the heating elements press against the severed strips, thereby sealing thestrips at predetermined intervals. The space between the transversely sealed areas may be easily determined by the spacing of the heating elements.

After sealing, the severed strips may be passed between the rollers 24 and 25. The roller 24 has mounted thereon two spaced apart knife edges 24 which make contact with the severed strips at predetermined intervals. To provide a cutting surface, a strip of cardboard 3B is passed over the roll 25, this roll being designed to move the cardboard 30 forwardly about 1 6 of an inch, in the direction indicated by the arrow, immediately before a knife edge 24 engages the strip to present a smooth surface to the strip at the point of cutting.

The severed bags slide down the chute 3| into one of the containers 21, a separator 26 being provided in the chute to direct the bags from the strips into their respective containers.

A preferred form of bag is illustrated in Figures 3 and 4. The folded strips are severed longitudinally along the line indicated by the numeral l6, transversely heat sealed along the lines indicated by the numeral 40, and out transversely along the dotted lines indicated by the numeral M. In cutting along the line I6, a longitudinally extending pouch-type opening 42 is formed.

In the modification of the invention illustrated in Figures 5 through 9, the steps of forming the bag are the same as that described hereinabove with the difference that a heat sealing device is mounted on the machine for continuously sealing the longitudinally folded edges I l of the strips to the underlying surface. The folded strip of material is advanced over a plate 5|. A roller 50 having two spaced apart heating elements 52 is mounted on the machine immediately above the plate 5| and exerting pressure thereon. Each of the spaced apart elements is preferably designed to contact the strip of material along one of the folded edges to seal the edge to its underlying surface. The strip of material is then severed along the line of demarcation between the folded edges and transversely heat sealed as described above. In this modification, the transverse cutting elements are designed to cut the severed strips transversely between the transversely sealed areas in addition to cutting them in the heat sealed areas.

The transverse cutting element is easily designed to cut the strips transversely at any predetermined intervals by the spacing of the knives 24.

Figures '7, 8 and 9 illustrate a bag formed by this modification of the invention. The bag strip is heat sealed along the longitudinally folded edges, the numeral 60 indicating the longitudinally extending heat sealed areas, severed along the line of demarcation indicated by the numeral l6 transversely heat sealed along the line 6|, and severed along the dotted lines indicated by the numeral 62. In this modification of the invention, the bag is of the end-opening type as distinguished from the side opening or pouchtype bag described hereinbefore.

Various modifications may be made in the preferred embodiment of the invention described and illustrated herein. For example, the final operation of cutting the strips transversely into bags of predetermined lengths may be carried out in conjunction with a machine for filling and sealing the bags. In such a modification, the product of the present machine would be in the form of a pair of strips of indefinite length, each strip divided by transverse or by transverse and longitudinal heat sealing into compartments of predetermined size. In such a modification, it would only be necessary to remove the roller 23 and the t in edges 4 and substitute therefor a roller on which the strip of material would be wound into the form of a roll. This modification of the invention is illustrated in Figure 10,

the winding roll being indicated by the numeral 10.

It will be understood, also, that in folding the longitudinal edges of the strip inwardly towards the longitudinal axis thereof, the opposing edges II can be spaced apart any predetermined distance. In certain types of bags, it may be desired to form a flap, which, subsequently, is folded over the opening. In such a bag, the opposing edges ll would be spaced apart a suflicient distance to form the flap. A bag of this type is illustrated in Figure 11, the flap being indicated by the numeral 1 I.

It has been found, in the operation of a bag making machine embodying the improvements of the present invention, that the volume of production from such machine is doubled with no increase in operating or maintenance costs.

What I claim as new and desire to protect by Letter Patent of the United States is:

1. In a'bag making machine for the manufacture of bags from a continuous strip of heat sealable material, means for advancing the strip of material through the machine, means for exerting tension on the strip, means for folding the edges of the strip inwardly towards the longitudinal axis thereof but leaving a line of demarcation therebetween, means for longitudinally heat sealing the opposing edges of the folded strip to the underlyin surface thereof, cutting means mounted on said machine in alignment with the line of demarcation between the opposing edges of the folded strip, means for heat sealing the severed strips transversely at predetermined intervals, and means for cutting said strips at predetermined intervals.

2. The method of making bags whichicomprises folding the edges of a strip of heat sealable material of indefinite length inwardly towards the longitudinal axis thereof, the opposing edges being sufiiciently spaced apart to form a line of demarcation therebetween, longitudinally heat sealing the opposing edges of the strip to the underlying surface thereof, cutting the strip longitudinally along the line of demarcation be tween the opposing edges, and heat sealing and cutting the severed strips transversely at predetermined intervals.

3. In a bag machine for the manufacture of bags from a continuous strip of heat sealable material, means for advancing the strip of material through said machine, means for folding the longitudinal edges of the strip inwardly toward each other alon the longitudinal axis of the strip in proximate but short of abutting relationship leaving a line of demarcation therebetween, means for cuttin the folded strip longitudinally along said line of demarcation, means for heat sealing and severing each severed strip transversely at predetermined intervals.

4. In a bag machine for the manufacture of bags from a continuous strip of heat sealable material, means for advancing the strip of material through said machine, means for folding the longitudinal edges of the strip inwardly toward each other along the longitudinal axis of the strip in proximate but short of abutting relationship leaving a line of demarcation therebetween, means for cuttin the folded strip longitudinally along said line of demarcation, means for heat sealing each severed strip transversely at predetermined intervals, and means for severing each strip transversely through the heat sealed areas.

GORDON A. HAUGH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,125,758 Waters Aug. 2, 1938 2,261,591 Rutter Nov. 4, 1941 2,224,513 Holmlund Dec. 10, 1940 

